Samsung Galaxy R - audio menu not accessible

Hello, I try to change volume on my Galaxy R through the code *#*#197328640#*#* and i cannot access to (5) AUDIO menu. When I tap on the screen on AUDIO menu it looks that it will access to it but then immediately returns me to main service menu.
In to the other menus i can access without problems but the AUDIO menu dont work :no:
Please, could you help me how can I access to AUDIO menu?
My phone is not ROOTed.
Thanks a lot.

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